逻辑预习作业前半部分做题版本

1、1. Parlands alligator population has been declining in recent years, primarily because of hunting. Alligators prey heavily on a species of freshwater fish that is highly valued as food by Parlanders, who had hoped that the decline in the alligator population would lead to an increase in the numbers

2、of these fish available for human consumption. Yet the population of this fish species has also declined, even though the annual number caught for human consumption has not increased.Which of the following, if true, most helps to explain the decline in the population of the fish species?(A) The decl

3、ine in the alligator population has meant that fishers can work in some parts of lakes and rivers that were formerly too dangerous.(B) Over the last few years, Parlands commercial fishing enterprises have increased the number of fishing boats they use.(C) The main predator of these fish is another s

4、pecies of fish on which alligators also prey.(D) Many Parlanders who hunt alligators do so because of the high market price of alligator skins, not because of the threat alligators pose to the fish population.(E) In several neighboring countries through which Parlands rivers also flow, alligators ar

5、e at risk of extinction as a result of extensive hunting.2. NorthAir charges low fares for its economy-class seats, but it provides very cramped seating and few amenities. Market research shows that economy passengers would willingly pay more for wider seating and better service, and additional reve

6、nue provided by these higher ticket prices would more than cover the additional cost of providing these amenities. Even though NorthAir is searching for ways to improve its profitability, it has decided not to make these improvements.Which of the following, if true, would most help to explain NorthA

7、irs decision in light of its objectives?(A) None of NorthAirs competitors offers significantly better seating and service to economy-class passengers than NorthAir does.(B) On many of the routes that NorthAir flies ,it is the only airline to offer direct flight.(C) A few of NorthAirs economy-class p

8、assengers are satisfied with the service they receive ,given the low price they pay.(D) Very few people avoid flying on NorthAir because of the cramped seating and poor service offered in economy class.(E) The number of people who would be willing to pay the high fares NorthAir charges for its busin

9、ess-class seats would decrease if its economy-class seating were more acceptable.3. Many athletes inhale pure oxygen after exercise in an attempt to increase muscular reabsorption of oxygen. Measured continuously after exercise, however, the blood lactate levels of athletes who inhale pure oxygen ar

10、e practically identical, on average, to those of athletes who breathe normal air. The lower the blood lactate level is, the higher the muscular reabsorption of oxygen is.If the statements above are all true, they most strongly support which of the following conclusions?(A) Athletes muscular reabsorp

11、tion of oxygen is not increased when they inhale pure oxygen instead of normal air.(B) High blood lactate levels cannot be reduced.(C) Blood lactate levels are a poor measure of oxygen reabsorption by muscles.(D) The amount of oxygen reabsorbed by an athletes muscles always remains constant.(E) The

12、inhaling of pure oxygen has no legitimate role in athletics.4. High levels of fertilizer and pesticides, needed when farmers try to produce high yields of the same crop year after year, pollute water supplies. Experts therefore urge farmers to diversify their crops and to rotate their plantings year

13、ly.To receive governmental price-support benefits for a crop, farmers must have produced that same crop for the past several years.The statements above, if true, best support which of the following conclusions?(A) The rules for governmental support of farm prices work against efforts to reduce water

14、 pollution.(B) The only solution to the problem of water pollution from fertilizers and pesticides is to take farmland out of production.(C) Farmers can continue to make a profit by rotating diverse crops, thus reducing costs for chemicals, but not by planting the same crop each year.(D) New farming

15、 techniques will be developed to make it possible for farmers to reduce the application of fertilizers and pesticides.(E) Governmental price supports for farm products are set at levels that are not high enough to allow farmers to get out of debt.5. The growing popularity of computer-based activitie

16、s was widely expected to result in a decline in television viewing, since it had been assumed that people lack sufficient free time to maintain current television viewing levels while spending increasing amounts of free time on the computer. That assumption, however, is evidently false: In a recent

17、mail survey concerning media use, a very large majority of respondents who report increasing time spent per week using computers report no change in time spent watching television.Which of the following would it be most useful to determine in order to evaluate the argument?(A) Whether a large majori

18、ty of the survey respondents reported watching television regularly(B) Whether the amount of time spent watching television is declining among people who report that they rarely or never use computers(C) Whether the type of television programs a person watches tends to change as the amount of time s

19、pent per week using computers increases(D) Whether a large majority of the computer owners in the survey reported spending increasing amounts of time per week using computers(E) Whether the survey respondents reports of time spent using computers included time spent using computers at work6. Archaeo

20、logists use technology to analyze ancient sites. It is likely that this technology will advance considerably in the near future, allowing archaeologists to gather more information than is currently possible. If they study certain sites now, they risk contaminating or compromising them for future stu

21、dies. Therefore, in order to maximize the potential for gathering knowledge in the long run, a team of archaeologists plans to delay the examination of a newly excavated site.Which of the following would be most useful to investigate for the purpose of evaluating the plans prospects for achieving it

22、s goal？(A) Whether any of the contents of the site will significantly deteriorate before the anticipated technology is available.(B) Whether there will continue to be improvements on the relevant technology.(C) Whether the team can study a site other than the newly excavated site for the time being.

23、(D) Whether the site was inhabited by a very ancient culture.(E) Whether the anticipated technology will damage objects under study.7. Krenlands steelmakers are losing domestic sales because of lower-priced imports, in many cases because foreign governments subsidize their steel industries in ways t

24、hat are banned by international treaties. But whatever the cause, the cost is ultimately going to be jobs in Krenlands steel industry. Therefore, it would protect not only steelmaking companies but also industrial employment in Krenland if our government took measures to reduce cheap steel imports.W

25、hich of the following, if true, most seriously weakens the editorials argument?(A) Because steel from Krenland is rarely competitive in international markets, only a very small portion of Krenlandian steelmakers revenue comes from exports.(B) The international treaties that some governments are viol

26、ating by giving subsidies to steelmakers do not specify any penalties for such violations.(C) For many Krenlandian manufacturers who face severe international competition in both domestic and export markets, steel constitutes a significant part of their raw material costs.(D) Because of advances in

27、order-taking, shipping, and inventory systems, the cost of shipping steel from foreign producers to Krenland has fallen in recent years.(E) Wages paid to workers in the steel industry in Krenland do not differ significantly from wages paid to workers in many of the countries that export steel to Kre

28、nland.8. In parts of South America, vitamin-A deficiency is a serious health problem, especially among children. In one region, agriculturists hope to improve nutrition by encouraging farmers to plant a new variety of sweet potato called SPK004 that is rich in betacarotene, which the body converts i

29、nto vitamin A. The plan has good chances of success, since sweet potato is a staple of the regions diet and agriculture, and the varieties currently grown contain little beta-carotene.Which of the following, if true, most strongly supports the prediction that the plan will succeed?(A) The growing co

30、nditions required by the varieties of sweet potato currently cultivated in the region are conditions in which SPK004 can flourish.(B) The flesh of SPK004 differs from that of the currently cultivated sweet potatoes in color and texture, so traditional foods would look somewhat different when prepare

31、d from SPK004.(C) There are no other varieties of sweet potato that are significantly richer in beta-carotene than SPK004 is.(D) The varieties of sweet potato currently cultivated in the region contain some important nutrients that are lacking in SPK004.(E) There are other vegetables currently grown

32、 in the region that contain more beta-carotene than the currently cultivated varieties of sweet potato do9. In order to reduce dependence on imported oil, the government of Jalica has imposed minimum fuel-efficiency requirements on all new cars, beginning this year. The more fuel-efficient a car, th

33、e less pollution it produces per mile driven. As Jalicans replace their old cars with cars that meet the new requirements, annual pollution from car traffic is likely to decrease in Jalica.Which of the following, if true, most seriously weakens the argument?(A) In Jalica, domestically produced oil i

34、s more expensive than imported oil.(B) The Jalican government did not intend the new fuel-efficiency requirement to be a pollution-reduction measure.(C) Some pollution-control devices mandated in Jalica make cars less fuel-efficient than they would be without those devices.(D) The new regulation requires no change in the chemical formulation of fuel for cars in Jalica.(E) Jalicans who get cars that are more fuel-efficient tend to do more driving than before10. Art restorers who have been studying the factors that cause Rena